Implement `Arbitrary` for all remaining types. #101

Job	Run time
Check code formatting	3s
Linux (1.56.0)	1m 57s
Linux (stable)	23s
Linux (beta)	22s
Linux (nightly)	19s
Linux (--features serde, 1.56.0)	2m 9s
Linux (--features serde, stable)	23s
Linux (--features serde, beta)	25s
Linux (--features serde, nightly)	24s
Linux (--no-default-features --features libm, 1.56.0)	1m 59s
Linux (--no-default-features --features libm, stable)	15s
Linux (--no-default-features --features libm, beta)	19s
Linux (--no-default-features --features libm, nightly)	18s
Linux (stable, --features mint)	31s
Linux (stable, --features bytemuck)	23s
Linux (stable, --features arbitrary)	30s
Linux (nightly, --features unstable)	16s
Linux (nightly, --features unstable,serde)	21s
Result	1s
	11m 18s

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